Rock-drill



(No Model.)

11A. ARMSTRONG.

ROGK DRILL.

No.290.309. Patented Dec. 18,1883.

Nrrnn STATES iPATFElJT FFICEQ EDiVIN A. ARMSTRONG, OF DETROIT, MICHIGAN.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 299,809, dated December 18, 1883.

Application filed July 5,1982. Renewed April 1.", 18:3.

To all whom it may concern:

Be it known that I, EDWIN A. Anns'rnoxe, of Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Rock-Drills; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

The nature of this invention relates to certain new and useful improvements in the 0011- struction of rock-drills of that class which are designed to be operated by hand.

The invention consists, first, in the construction and arrangement of parts for controlling the feed; second, in the construction and arrangement of parts for governing the movements of the drill shaft or bar; and, third, in the peculiar construction, arrangement, and various combinations of the parts, all as more fully hereinafter set forth.

Figure 1 is a perspective view of my improved rock-drill with one of the crank-wheels removed. Fig. 2 is avertical section through the frame. Fig. 3 is a sectional plan view,

' showing the arrangement of pawls and ratchets for governing the rotating movement of the drill bar or shaft. Fig. 4 is a central vertical section through the ratchet-wheels shown in Fig. 3.

In the accompanying drawings, A. represents the frame, provided at its lower end and at the rear side with a trunnion or bearing, a. This trunnion has a bearing in the clip-box B, which is provided upon each side with bearings or trunnions O, which are secured within the clips or bosses D, rising from the tripod frame E. By this manner of securing the frame within the tripod,it can readily be seen that the frame A can be adjusted radially on the tripod, so as to present the drill to the work at almost any angle. The fran ie has at its upper and lower ends and uponeach side the forwardly-proj ecting arms a, the inner faces of which are grooved to form guides, in which the slides F of the cross-head G have a reciprocating motion, such cross-head carrying the operating parts of the drill.

The cross-head G is provided with the two rearwardly-projecting lugs (I, through which is properlyjournaledthefeed-rod H, thelower (No model.)

end of which is screw-threaded and tapped through the base of the frame A, as is clearly shown in Fig. 2. To this feed-rod H are rigidly secured the collars 6, one upon each side of the lower stud, d, while the upper end of the rod has secured to it the crown-ratchet wheel I and a crank-handle, J. As this feedrod is rotated by hand or automatically bythe machine, as hereinafter described, the crosshead G is advanced to or retracted from the work,being guided in this reciprocating movement by the guide-arms c of the supportingframe.

Rigidly secured to the front of the cross-head G, and upon each side thereof, are the boxes K, in which is properly j ournaled the shaft L, upon each end of which is properly secured a crank or fly wheel, M, by means of which said shaft is rotated. Rigidly secured upon this shaft M, in any convenient manner, is the S- shaped cam or wiper, M, which, in the continued rotation of the shaft M, comes in contact with the under face of the disk N, which is rigidly and adjustably secured upon the upper end of the drill-stock 0, thereby communicating an intermittent alternating rectilinear motion to such drill-stock. The upper end of this drill-stock projects through the top girt of the cross head and extends below and through the bed-plate P, which also forms the girt at the lower end of the cross-head. The drill-stock also passes through abox,Q,which forms a portion of the lower stud, d, and this box receives the two ratchet-wheels Band B, through which the drill-stock also passes, each of the ratchet-wheelsRRbeing provided with a spring-pawl, 9, within the box Q, to prevent a retrograde movement of the ratchets in the operation of the machine. The drill-stock has formed in it a spiral channel, 71., and a straight channel, z, while the ratchet-wheel R is provided with an incline or spiral spline, k, which engages with the spiral channel h, and the ratchet-wheel R is provided with a straight spline, Z, which engages with the straight channel i in the drill-stock.

'8 represents a coil-spring around the drillstock, the lower end of which rests within an annularly-recessed disk, T, rigidly secured to the lower end of the drill-stock, while the upper end of such spring rests against the lower face of the box Q; and between the lower face of the disk T and the bed-plate P, I place a rubber spring, U. In the rotation of the shaft and the engagement of one end of the cam M with the disk N, the drill-stock must necessarily be raised or retracted and compress the spring S. In this upward travel of the drillstock the ratchet-wheel B, being prevented from a retrograde movement by its respective pawl, compels the drill-stock to partially rotate,while the ratchet-wheel R is partially rotated by this movement of the drill-stock. As the disk N drops oil from the end of the cam M, the expansion of the spring S forcibly drives the drill-stock downward or outward. The spline Z compels the drillstock to travel in a direct line, the two ratchet-wheels Rand It being prevented from having a retrograde movement, precluding the possibility of the drillstock having any rotary movement in the downstroke. The lower end of the drillstoek is provided with any suitable means for holding the drill.

V represents a double cam or wipe, rigidly secured upon the shaft L, which, in the rotation of said shaft, comes in contact with the lower end of the lever WV, which is properly fulcrunied to the frame, as shown. The upper end of this lever has pivotally secured to it an arm, X, the outer end of which carries the double pawls Y, which engage with the teeth of the crown-ratchet 1. Between the upper portion of the lever W and the cross-head G, I place a suitable spring, in, which forces that end of the lever outward as the lower end is released by the wipe V; hence in each rotation of the shaft L this lever is operated twice, causing, by the connections herein named, the feed-rod H to intermittently rotate and necessarily advance the cross-head and drill to the work. A regulator-screw, Z, is tapped through the cross-hcad, with the outer end engaging in any convenient and suitable manner with the lever \V, by means of which the movement of the lever may be regulated so as to govern the feed-as, for instance, it may be regulated by limiting the play of the upper portion of the lever to such an extent that it will only travel the distance of one tooth, thus giving a slow feed, whereas, if a more rapid feed is desired, greater liberty is given to the movement of the lever.

The tripod Eis constructed in two parts, as shown, and at the head is connected by the means already described for holding the frame A to place. The two rear legs, A, of the tripod E terminate in a foot, B, their meeting faces being recessed, as shown, to receive the divided ball or sphere O, which is centrally recessed, as shown, to receive the rear extension-leg, D, said foot and rear legs being secured together by means of bolts '11,. The front legs, E, of the tripod terminate in feet F, which are recessed, as shown, to receive the divided balls G, which, in turn, are centrally bored out to receive the extension-legs H, said balls and legs being secured to their proper position by means of the followers I, which, in turn, are rigidly secured within the feet by means of the bolts K.

- By this construction of parts it will be seen that the extension-legs can readily be adjusted at almost any an gle from the tripod,to suit the conditions required by the work to be performed by the drill.

Vi hat I claim as my invention is 1. In a rock-drill, and in combination with a frame, A, having arms a, with gnideways, the cross-heads G, having guides F, thethreaded rod 11', and connections with the main sh aft for automatically feeding said cross heads within the frame, substantially as specified. I

2. In a rock-drill, and in combination with the frame A, mounted upon trunnions, substantially as described, the cross-head G, actuated by the feed-shaft H, which carries a crown-ratchet, I, which, in turn, is actuated and engages with pawls Y, operated by the lever W and the wipe V upon the main shaft L, substantially as described.

3. The frame A, having trunnion a, and the casting B, having side trunnions arranged at right angles to the trunnion a, and embraced by the clamps D of the legs E A of the tripod, combined and arranged to serve as set forth.

4. The combination of the leg A, having duplex foot 13, the meeting faces of which are recessed to receive the divided ball C,with the leg D and securing means n, as set forth.

5. The legs E E, having clamps D and recessed feet F, combined with the casting B, the legs H, follower I, divided balls G, and securing means K, as specified.

E. A. ARMSTRONG.

Witnesses:

II. S. SPRAGUE, E. SOULLY. 

